hey I just put on a Raptar Wide Angle 90mm f6.8 and had a look
maybe at infinty it mite just be there but not bad if you move the lens up 2 to 4 mm it would go away. the same thing with a 84mm lens that I have its about the same

NOW with other lens like super Angulon or Angulon it mite be in the way & need to drop the bed as the Super does have a Wider Angle

But with my Optar f6.8 that is "not a Wide Angle" or Raptar Wide Angle 90mm f6.8 (or a Optar wide angle about the same) I can't say that I have ever notested seeing the bed in any of my shots!!
I do have a super Angulon on my Graphic View & I can't rember ever
trying it out on a Crown or Speed!!